Sort table columns alphabetically in sql editor left bar

[vera-liu]

Request: #1444
Done: Added sorting in render() of TableElement, table columns are sort by names in SqlEditorLeft now

Before:

After:

needs-review @mistercrunch

[mistercrunch]

Oh I just saw this after I landed a similar PR I wrote in the train, I didn't mean to "take over", sorry about that.
#1467

I think the default column order is better default than an alphabetical sort as a default since many people are careful when defining the column ordering (pk fields first, name, description, ..., audit fields last, ...).

[ascott]

it would be great if we posted on the issue when we are starting work and/or check if there is someone assigned already, so we don't work over each other in the future. nice that this was just a small change, so nbd :)